System Design
Solar Canopy Systems — Mono-Pitch, T-Frame & Cantilever
Three structural configurations engineered to BS EN 1991. Compare them below against your car park geometry, capacity target and budget.
What to verify before you appoint an installer
Which system is right for your site?
The three canopy configurations cover the vast majority of UK commercial car park scenarios. Your choice comes down to three variables: available column positions (can you lose a central row?), the coverage you need per structural element, and your aesthetic or access requirements. Any installer’s proposal should include a site assessment and a design recommendation. The single-slope option is covered in detail on the mono-pitch canopy page.
Mono-Pitch Canopy
Simple. Cost-effective. Fast to install.
£1,100–£1,350/kWp
Typical installed cost
The mono-pitch is the most widely installed commercial solar canopy in the UK. A single-direction pitched structure carries panels at a shallow pitch, typically 5–10° over car parking because a steeper deck needs more height and steel, with efficient gravity-fed drainage integrated into the gutter and downpipe system. Steel column rows run along one edge of each bay.
Best for
Standard car parks with clear orientation preferences, smaller installations (50–150 kWp), and budget-conscious projects.
- ✓ Lowest per-kWp installation cost of the three system types
- ✓ Optimal panel angle (30–35°) for UK solar irradiance
- ✓ Quick installation — typically 2–4 weeks for 50 kWp systems
- ✓ Efficient gravity-fed drainage with integrated guttering
- ✓ Minimal wind resistance reducing structural steel requirements
- ✓ Single-direction snow shedding for low-maintenance operation
Typical system size
50–150 kWp
Height
2.5–4 m
Span
5–6 m
Foundations
Pad or pile
T-Frame (Dual-Pitch) Canopy
Maximum coverage. Impressive presence.
£950–£1,200/kWp
Typical installed cost
The T-frame or dual-pitch configuration runs two rows of panels from a central apex, sharing a single column row down the middle. This doubles the coverage per column row compared to mono-pitch, making it the most cost-efficient configuration for large retail parks, supermarkets, and multi-bay installations where density matters.
Best for
Large commercial developments, retail parks, and supermarket car parks (150–500+ kWp) where maximum coverage per structural column is a priority.
- ✓ Dual-pitch design for maximum panel capacity per structural column
- ✓ Better structural load distribution across central column row
- ✓ Higher clearance at centre (up to 4 m) improving HGV access
- ✓ Efficient drainage from both sides reducing waterlogging risk
- ✓ Scalable modular design for phased installation programmes
- ✓ Impressive architectural presence enhancing commercial property appeal
Typical system size
150–500+ kWp
Height
3–4 m
Span
10–12 m
Foundations
Pad or pile
Cantilever Canopy
No central columns. Premium aesthetic.
£1,300–£1,600/kWp
Typical installed cost
The cantilever configuration projects the canopy structure from a single column line on one side, leaving the opposite side completely clear. No central columns means unrestricted vehicle movement, no door-ding risk, and a cleaner aesthetic suited to premium hotels, HQ campuses, and constrained car parks where column positions would disrupt layout.
Best for
Premium installations, constrained spaces, and retrofits where maintaining existing car park layout and traffic flow is essential.
- ✓ No central columns — unrestricted parking and easy manoeuvring
- ✓ Maximum space utilisation in tight or narrow car parks
- ✓ Premium aesthetic suited to hotels, HQ campuses, and retail flagships
- ✓ Ideal for retrofitting existing car parks without layout changes
- ✓ Single-side foundation reduces ground disruption during installation
- ✓ Enhanced user experience — no door-ding risk from central columns
Typical system size
30–200 kWp
Height
2.5–4 m
Span
5–7 m cantilever
Foundations
Deep pile
What to require from any installer
Whichever system you choose, ask any installer to show that it meets the full UK engineering and compliance stack:
- BS EN 1991-1-4 (Eurocode 1): Site-specific wind loading calculations based on terrain category, altitude, and local topography
- BS EN 1991-1-3: Snow loading — UK ground snow load maps applied to roof geometry
- BS EN 1993 (Eurocode 3): Structural steel design — all members sized to partial factor methodology
- BS 7671 18th Edition Am. 2: Full electrical installation, inspection, and certification
- CDM 2015: A principal designer and principal contractor appointed wherever more than one contractor is involved
- Cat 3 independent check: The structural design independently verified before fabrication
- MCS contractor certification: A route to the Smart Export Guarantee for installations of 50 kW or less, and often asked for by insurers
- G99 DNO connection agreement: Applied for early and managed through to connection
Not sure which system is right for you?
Use the instant estimate for an indicative size, cost range and payback, then compare the three configurations above. We reply by email, with no obligation.
Instant canopy estimate
Size and price your car park canopy in 30 seconds
Enter the number of parking spaces and your postcode and the page works out an indicative system size, capital cost range, annual generation and payback from the figures published on this site. It is an estimate, not a quote. Add your email afterwards if you want us to look at it with you; we reply by email.